/*
 * Copyright (c) 2010-2011, okazoh_tk. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  - Neither the name of the copyright holder nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef ALKES_OPENGL_IMAGE_BUFFER_H_INCLUDED_
#define ALKES_OPENGL_IMAGE_BUFFER_H_INCLUDED_

#include "alkes/media/MemoryImageBuffer.h"
#include "alkes/media/HeapImageBuffer.h"
#include "alkes/opengl/GLWrapper.h"

namespace alkes {

class AL_OGL_EXPORT GLImageBuffer
    : public MemoryImageBuffer
{
    AL_DECLARE_CLASS(GLImageBuffer, MemoryImageBuffer);

public:
    static GLImageBuffer* create(uint16_t image_width, uint16_t image_height, PixelFormat format, bool write_only = false);

    bool getTexture(GLuint& texture);

protected:
    enum TextureFlag
    {
        AL_TEXFLAG_GENERATED = AL_DERIVED_CLASS_USABLE,
        AL_TEXFLAG_DIRTY,
    };

    GLImageBuffer(const ImageBufferCaps& caps, int32_t pitch, bool write_only);
    virtual ~GLImageBuffer();
    virtual void destroy();

    virtual void* onLockRect(const Rect& rect, uint32_t lock_mode, int32_t* pitch);
    virtual void onUnlockRect(const Rect& locked_rect);

    bool createWriteBuffer(const Rect& rect, bool readable);
    bool generateTexture();

private:
    GLuint texture_;
    intrusive_ptr<HeapImageBuffer> lock_image_;
};

}

#endif
